Manual:$wgCookieDomain/zh

From Linux Web Expert

<translate> Cookies</translate>: $wgCookieDomain
Explicit domain for login cookies.
<translate> Introduced in version:</translate>pre 1.1.0
<translate> Removed in version:</translate><translate> still in use</translate>
<translate> Allowed values:</translate>(字符串)
<translate> Default value:</translate>''

详情

Set to an explicit domain on the login cookies, e.g. thissubdomain.mydomain.org or .mydomain.org for all your subdomains.

如果默认的Cookie作用域没有设置,那么PHP中的setcookie函数会将Cookie的作用域设为当前域。 This is a bad thing if e.g. your site is available from both www.example.com and example.com, since users that log into the former will be logged out as soon as they visit the latter.